Scallop

Scallops do not crawl or burrow, so do not have a large ‘foot’. Instead, they have a highly developed adductor muscle, by means of which they can open and close their shells and so propel themselves through the water. The Japanese name for scallop means, literally, ‘full-sail fish’, from the manner of its movement with one shell raised. Not all scallops exercise this ability. Some remain anchored by a byssus to some solid object. Others start life thus and then become free rangers, swimming or resting on the sea bottom.